This paper describes a possible way to build a simulation model of the most important part of a power plantthe turbine with reheating section. The turbine is a key part of the power plant that allows the conversion of the heat energy to electricity via mechanical energy. The paper describes the usual construction of the steam reheater and the turbine connection. The mathematical analysis for all parts, that is, for all the units of the steam reheater, is presented in the form of ordinary differential equations. The turbine simulation model is based on real process measurements and uses the ARX model. Finally some verification results are presented.

This paper focuses on cogeneration units (Combined Heat and Power (CHP) plants), especially on simulation models of these units or their main parts. The combined production of heat and electricity seems to be a good option for a future market. Cogeneration has fewer losses than traditional production, but on the other hand there are some consumption criteria that must be met. The result of this paper is a software library of the significant parts of CHP plants of different types. Firstly there are short introductions to the two main types of units used for low output power (up to approximately 100 kW) -the gas/biogas/diesel/biodiesel engine and gas (micro-)turbine. The next section describes the basic physical and mathematical relations and the final section presents some results.

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